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- 저자 : Hublin, Christer (검색결과 3 건)
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Optimization of Biogas Production from Co-digestion of Whey and Cow Manure
Andrea Hublin,Tatjana Ignjati Zokic,Bruno Zelic 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.6
Anaerobic co-digestion is effective and environmentally attractive technology for energy recovery from organic waste. Organic, agricultural and industrial wastes are good substrates for anaerobic co-digestion because they contain high levels of easily biodegradable materials. In this paper enhancement of biogas production from codigestion of whey and cow manure was investigated in a series of batch experiments. The influence of whey ratio on specific biogas production in a mixture with cow manure was analyzed at 35 and 55oC, for different initial pH values and for different concentrations of supplemental bicarbonate in experiments carried out over 12 days. Good biogas production (6.6 dm3/dm3), methane content (79.4%) in a biogas mixture and removal efficiencies for total solids (16%)were achieved at optimum process conditions (temperature of 55oC, 10% v/v of whey and 5 g/dm3 NaHCO3 in the initial mixture). In order to validate optimized conditions for co-digestion of whey and cow manure in the one-stage batch process, the experiments were performed within 45days. The high biogas production (21.8 dm3/dm3), a good methane content (78.7%) in a biogas mixture as well as maximum removal efficiencies for total solids (32.3%),and chemical oxygen demand (56.3%), respectively indicate that whey could be efficiently degraded to biogas in a onestage batch process when co-digested with cow manure.
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Vuokko, Aki,Karvala, Kirsi,Suojalehto, Hille,Lindholm, Harri,Selinheimo, Sanna,Heinonen-Guzejev, Marja,Leppamaki, Sami,Cederstrom, Sebastian,Hublin, Christer,Tuisku, Katinka,Sainio, Markku Occupational Safety and Health Research Institute 2019 Safety and health at work Vol.10 No.3
Background: Chronic nonspecific symptoms attributed to indoor nonindustrial work environments are common and may cause disability, but the medical nature of this disability is unclear. The aim was to medically characterize the disability manifested by chronic, recurrent symptoms and restrictions to work participation attributed to low-level indoor pollutants at workplace and whether the condition shares features with idiopathic environmental intolerance. Methods: We investigated 12 patients with indoor aire-related work disability. The examinations included somatic, psychological, and psychiatric evaluations as well as investigations of the autonomic nervous system, cortisol measurements, lung function, and allergy tests. We evaluated well-being, health, disability, insomnia, pain, anxiety, depression, and burnout via questionnaires. Results: The mean symptom history was 10.5 years; for disabling symptoms, 2.7 years. Eleven patients reported reactions triggered mainly by indoor molds, one by fragrances only. Ten reported sensitivity to odorous chemicals, and three, electric devices. Nearly all had co-occurrent somatic and psychiatric diagnoses and signs of pain, insomnia, burnout, and/or elevated sympathetic responses. Avoiding certain environments had led to restrictions in several life areas. On self-assessment scales, disability showed higher severity and anxiety showed lower severity than in physician assessments. Conclusion: No medical cause was found to explain the disability. Findings support that the condition is a form of idiopathic environmental intolerance and belongs to functional somatic syndromes. Instead of endless avoidance, rehabilitation approaches of functional somatic syndromes are applicable.
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Clinical Characteristics of Disability in Patients with Indoor Air–Related Environmental Intolerance
Aki Vuokko,Kirsi Karvala,Hille Suojalehto,Harri Lindholm,Sanna Selinheimo,Marja Heinonen-Guzejev,Sami Leppämäki,Sebastian Cederström,Christer Hublin,Katinka Tuisku,Markku Sainio 한국산업안전보건공단 산업안전보건연구원 2019 Safety and health at work Vol.10 No.3
Background: Chronic nonspecific symptoms attributed to indoor nonindustrial work environments are common and may cause disability, but the medical nature of this disability is unclear. The aim was to medically characterize the disability manifested by chronic, recurrent symptoms and restrictions to work participation attributed to low-level indoor pollutants at workplace and whether the condition shares features with idiopathic environmental intolerance. Methods: We investigated 12 patients with indoor airerelated work disability. The examinations included somatic, psychological, and psychiatric evaluations as well as investigations of the autonomic nervous system, cortisol measurements, lung function, and allergy tests. We evaluated well-being, health, disability, insomnia, pain, anxiety, depression, and burnout via questionnaires. Results: The mean symptom history was 10.5 years; for disabling symptoms, 2.7 years. Eleven patients reported reactions triggered mainly by indoor molds, one by fragrances only. Ten reported sensitivity to odorous chemicals, and three, electric devices. Nearly all had co-occurrent somatic and psychiatric diagnoses and signs of pain, insomnia, burnout, and/or elevated sympathetic responses. Avoiding certain environments had led to restrictions in several life areas. On self-assessment scales, disability showed higher severity and anxiety showed lower severity than in physician assessments. Conclusion: No medical cause was found to explain the disability. Findings support that the condition is a form of idiopathic environmental intolerance and belongs to functional somatic syndromes. Instead of endless avoidance, rehabilitation approaches of functional somatic syndromes are applicable.
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